It's called supply and demand.<quoted text>
At Obama’s Inauguration, the price at the pump for gas was $1.83. It has more than DOUBLED since.
On the day of Obama's Inauguration the demand for gas was low, very low because the economy was at it's lowest point leaving a George W Bush presidency.
At the end of the bad Bush term in office people didn't buy much gas, travel or anything else, so the demand was low - this makes the price lower. As the economy gets better the cost of gas will increase.
If you read a 7th grade economics book, chapter one - Supply and Demand, you may understand better.
The last two republican presidents was named, George H W Bush and George W Bush. Both of these republican presidents ended their presidency with a recession, which we are still trying to get out of. Republican mitT roMney offers the very same.
Now go vote - Obama